重点在于,返回$this指针,方便调用后者函数。
Operation.php
<?php namespace IMooc; class Operation { protected $number = 0; public function __construct($number) { $this->number = $number; } public function add($number) { $this->number += $number; return $this; } public function decrease($number) { $this->number -= $number; return $this; } public function multiply($number) { $this->number *= $number; return $this; } public function pision($number) { $this->number /= $number; return $this; } public function get() { return $this->number; } }
index.php
require __DIR__ . '/IMooc/Operation.php'; $operation = new IMooc\Operation(10); $result = $operation->add(2)->decrease(2) ->multiply(3)->pision(4) ->get(); var_dump($result);
执行结果
masaki@masaki-Inspiron:/var/www/imooc$ php index.php
float(7.5)
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